This format of light switch has three discreet switches on a single face plate. Basically this is three Single gang 1 way switches on a single face plate.

The only place you would use such a beast is if you had three lights (or sets of lights) in a single room each controlled by one of the single switches. This arrangement is not common, you are most likely to find a 3 gang 2 way switch used (this will do the same job but you will have spare L2 terminals on each gang that you would not need to use).

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